IN值比较多的情况下,查询比较慢,如何优化?

【 TiDB 使用环境】生产环境
【 TiDB 版本】7.1.5
【遇到的问题:问题现象及影响】IN值比较多的情况下,查询会很慢
以下表为例:

CREATE TABLE `t_asset` (
  `id` bigint(20) NOT NULL COMMENT '资产id',
  `create_time` datetime(6) DEFAULT NULL COMMENT '创建时间',
  `creator` varchar(255) DEFAULT NULL COMMENT '创建人',
  `deleted` bit(1) DEFAULT NULL COMMENT '删除状态 true 已删除 | false 未删除',
  `modifier` varchar(255) DEFAULT NULL COMMENT '最后修改人',
  `modify_time` datetime(6) DEFAULT NULL COMMENT '更新时间',
  `apply_date` datetime(6) DEFAULT NULL COMMENT '申请日期',
  `asset_number` varchar(255) DEFAULT NULL COMMENT '资产编号/物料代码',
  `booked_date` datetime(6) DEFAULT NULL COMMENT '入账时间',
  `extend` varchar(255) DEFAULT NULL COMMENT '扩展字段',
  `flow_no` varchar(255) DEFAULT NULL COMMENT '流程单号',
  `group_id` bigint(20) DEFAULT '0' COMMENT '分组id',
  `line_id` varchar(255) DEFAULT NULL COMMENT '行id',
  `model` varchar(255) DEFAULT NULL COMMENT '型号',
  `name` varchar(255) DEFAULT NULL COMMENT '资产名称',
  `owner` varchar(255) DEFAULT NULL COMMENT '所属人',
  `parent_id` bigint(20) DEFAULT NULL COMMENT '父资产id',
  `platform` varchar(255) DEFAULT NULL COMMENT '平台信息',
  `purchase_date` datetime(6) DEFAULT NULL COMMENT '采购日期',
  `serial_no` varchar(255) DEFAULT NULL COMMENT '序列号',
  `source` varchar(255) DEFAULT NULL COMMENT '资源来源',
  `extend_type` int(11) DEFAULT '6' COMMENT '资源类型扩展[设备(网络), 设备(非网络), 设备配套/模块, 服务器, 配件]',
  `type` int(11) DEFAULT NULL COMMENT '类型',
  `position_id` varchar(255) DEFAULT NULL COMMENT '位置id',
  `status` int(11) DEFAULT '0' COMMENT '资源状态码',
  `in_pool_flag` bit(1) DEFAULT NULL COMMENT '资源池标记位',
  `support_login` int(11) DEFAULT '2' COMMENT '免密登录',
  `msg` varchar(255) DEFAULT NULL COMMENT 'msg',
  `fixed_time` datetime(6) DEFAULT NULL COMMENT '信息完善时间',
  `confirm_status` int(11) DEFAULT '0' COMMENT '盘点状态:在用;闲置;损坏;遗失;已验收;未验收',
  `fixed` tinyint(1) DEFAULT '0' COMMENT '信息完善标记位',
  `extend_type_snapshot` int(11) DEFAULT NULL,
  `product_id` bigint(20) DEFAULT NULL COMMENT ' 产品分类id',
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
  KEY `t_asset_owner_IDX` (`owner`),
  KEY `t_asset_parent_id_IDX` (`parent_id`),
  KEY `IDX8dgrl9ohhkhqbu7q9ak8o66p8` (`group_id`),
  KEY `IDXkjd8t40esch6v61f15e3xs7wa` (`fixed`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin

做如下查询:

SELECT *
FROM t_asset a
WHERE a.id IN
# 挺长的,大概2000~4000多个id
      (5407245, 4789312, 4790104, 4790090, 146919, 146991, 146800, 4790169, 4790758, 4789391, 4788565, 4788849, 4790606,
       4788529, 5352812, 4790050, 4788988, 5411650, 4790510, 146828, 190720, 146850, 4789374, 4791460, 4790672, 4790092……)
  AND a.group_id IN
      (22099, 56611, 4825, 3570, 3571, 4984, 10591, 56429, 22145, 3631, 3572, 58375, 539908, 58819, 3544, 3574, 310, 3632, 5081, 4222, 5001, 3630, 3633, 3634, 3635)
  AND a.deleted = 0;

表数据大概50万条不到。

这个表之前是在posgresql上的,现在迁到tidb上来。原先在postgresql上执行只需要150ms不到,postgresql的执行计划如下:

QUERY PLAN
Bitmap Heap Scan on asset a  (cost=7081.80..7161.33 rows=11 width=421) (actual time=5.461..8.338 rows=892 loops=1)
  Recheck Cond: ((resource_group_id = ANY ('{22099,56611,4825,3570,3571,4984,10591,56429,22145,3631,3572,58375,539908,58819,3544,3574,310,3632,5081,4222,5001,3630,3633,3634,3635}'::integer[])) AND (id = ANY ('{5407245,4789312,4790104,4790090,146919,146991,146800,4790169,4790758,4789391,4788565,4788849,4790606,4788529,5352812,4790050,4788988,5411650,4790510,146828,190720,146850,4789374,4791460,4790672,4790092,4791405,4788676,146995,4788504,4788705,4880236,4788471,4791425,4790323,4790394,146958,4789368,4788926,4791498,4790627,5394581,4791389,1179259,4788460,5404746,4789346,4788855,4789952,4790274,4788835,5364871,4788818,4791411,146941,4790961,332077,4788706,4788888,4790334,146961,146774,4790346,146784,4790374,4788839,4790155,4788791,146832,4790911,4788585,4790072,146883,146790,4788852,4789904,4790597,4789726,4788549,147020,4789293,4788713,257665,1296929,4790573,4788517,4788803,148956,5441969,4861681,218407,4791526,1070542,4791616,4788561,4861347,4789900,4790414,5379142,146844,4790224,4790223,4861750,4790352,4789705,5445209,4789338,4790383,146849,4788974,4790454,1285454,4789224,4790342,4790127,4790952,4789171,4790518,4790097,5352811,5448219,4789975,147051,4788817,5410058,4789740,4788711,4789305,142994,4788941,4790202,5375859,1345117,5364876,4788842,257662,5342016,1309728,190719,146996,5375856,146807,4790008,4790187,4788949,4790037,146965,4788771,4790226,5436859,148963,4790125,4789382,4788658,4788653,4790412,4788582,4791394,4790292,4789181,4790646,4789860,4791474,4791401,146796,4789568,4788515,5379724,4791519,4789742,4788488,4789826,4789311,4788458,4791504,4788552,4789002,4861357,4790076,1176643,4789995,4788857,4789763,4791412,4790422,147027,4790010,4788456,4789872,4788702,4789751,4789671,4788628,4882246,4789739,146928,4790466,148961,146823,4790405,5445364,4847857,146925,337612,4861740,87781,4790353,4790491,5418789,4788967,147026,4789759,1218483,5356143,4790069,4790337,5418352,4790201,4788556,4789142,4790399,4788975,4790135,4790197,5404744,4788760,148952,4790142,162300,147019,4790667,4791390,5445174,87830,4789365,4790022,4789935,4789692,4789940,5341047,4789393,4790106,4788660,4790042,5338735,4788905,4789173,4790269,4790253,5343937,4790958,4790277,5445369,4790227,4789566,5379713,146968,4788773,146913,4877887,4788589,5445360,4789936,402588,87853,4791470,146875,265106,4790062,4791534,4790641,4789351,146889,4791522,4789007,4788652,162301,4790164,146881,4788709,4790373,5365763,4790483,4788531,4790939,4791494,4790221,4788647,4790387,5378093,4788913,1189968,5341043,4788508,4791478,4790054,146870,5434365,4788827,4874194,4788509,4791492,147018,5448209,4788604,4788595,4790233,4788714,87641,559765,5415949,4788606,146940,4791507,4791415,5379717,4788557,5378571,4788903,4791496,4788861,4790099,4788829,150859,5445189,146888,4790551,4791418,4790619,4790936,257664,146777,4790325,4788683,4789204,4788475,5404749,146847,5422052,5402838,4788642,4879309,4791484,4788689,4881190,4788664,4790178,5355907,4788511,4789971,4789926,4791447,6000057,5448079,146783,386384,5436513,4791471,4790676,4790126,146838,4790077,4789767,146957,4788487,1197981,1264117,4790039,5395265,146896,4790389,4789982,4789386,4789758,1307879,4789380,4788512,5435652,4788993,4790212,4790392,4788629,4788482,5379737,4788911,4789159,4788726,5440147,5445205,4790023,1296928,5438479,5448428,4790651,4789834,4789768,4791509,4790110,4791403,4788490,5379728,4788631,5446824,1197979,4790948,4790087,146892,5396993,4791385,4790438,4788800,4788762,4788788,4787955,4788858,4790928,4790199,4788541,146782,4788806,4790391,4790372,4790452,4788922,4789292,5448434,4789735,4788562,4790230,4788862,146825,4790599,4791462,4789987,4790307,4790408,146951,5355904,4788848,4790133,5353899,549325,4789045,146962,5434369,4788747,146977,4789883,4788996,4789890,146871,4790536,141097,5444892,4789879,341314,4791479,537917,5353706,4791439,5396836,4788655,4788997,160341,4788994,4789849,4790607,146866,4788492,147037,4789116,4790029,4789341,5353484,5436515,4789810,4791452,4788598,147049,147056,5422059,5445171,5396153,4790572,1054282,4790504,5445363,5356141,87802,4788698,5379734,4791427,4789310,4788494,5445374,352168,4790249,4788992,4789863,274312,4789908,4791444,4791533,1307881,162264,4789852,4790427,4789851,4789244,4788866,4788686,5445172,4788527,4789186,4789010,4788914,146857,1195310,146974,4790063,4790052,4789149,146966,146922,1195309,4791414,4790013,4790457,4790542,4790358,4790289,4788753,5404745,146822,4788774,4790107,5418792,146813,4789564,146970,4789662,4789004,5443583,162265,4874547,5379722,272429,4790385,4789306,4790530,146934,4790605,147022,4790411,5422062,4789812,146867,4791535,4788891,4790492,5378569,4791456,4789563,4788884,4788581,4791627,4790418,4788924,5378573,4789958,4790649,4789931,146885,4788588,4788890,4790395,4790115,5449276,4791402,4790467,4791420,4788477,5434366,4789991,4788789,146839,4789677,4870670,192614,146835,4789815,4791457,5445375,591091,4788616,4791434,4790153,4789902,4790166,5403288,5403662,4785760,4789854,5408807,4788555,146938,146910,4788680,4789313,4788731,4788597,4789337,235319,4788641,147000,146770,4790481,5366452,4789099,426614,4789794,4788695,5445200,4791510,4789814,5445193,4789383,4789856,4789558,148964,4788540,4789911,5407468,5445183,4788727,4788921,146792,4842475,4788715,54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63,4788824,4788901,4788886,4789720,146978,5436862,4790116,5404072,4790482,4790497,5445208,4789152,146876,4790328,4789988,4789736,5436854,4789190,4789821,4788590,4791523,4789968,4789701,147041,4790340,4788912,4789161,4790946,5445207,147009,4790341,4789096,4789390,4788669,5379138}'::integer[])))
  Heap Blocks: exact=580
  ->  BitmapAnd  (cost=7081.80..7081.80 rows=11 width=0) (actual time=5.376..5.376 rows=0 loops=1)
        ->  Bitmap Index Scan on asset_resource_group_id_idx  (cost=0.00..126.12 rows=2071 width=0) (actual time=0.586..0.586 rows=1455 loops=1)
              Index Cond: (resource_group_id = ANY ('{22099,56611,4825,3570,3571,4984,10591,56429,22145,3631,3572,58375,539908,58819,3544,3574,310,3632,5081,4222,5001,3630,3633,3634,3635}'::integer[]))
        ->  Bitmap Index Scan on asset_pkey  (cost=0.00..6955.42 rows=2594 width=0) (actual time=4.735..4.735 rows=2584 loops=1)
              Index Cond: (id = ANY 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63,4788824,4788901,4788886,4789720,146978,5436862,4790116,5404072,4790482,4790497,5445208,4789152,146876,4790328,4789988,4789736,5436854,4789190,4789821,4788590,4791523,4789968,4789701,147041,4790340,4788912,4789161,4790946,5445207,147009,4790341,4789096,4789390,4788669,5379138}'::integer[]))
Planning time: 3.948 ms
Execution time: 9.172 ms

迁到tidb之后,同样查询要1.3秒左右。tidb的执行计划如下:

Selection_6, 465.94, 894, root, , time:69.1ms, loops:2, RU:7.126364, eq(res_cube_server_stg.t_asset.deleted, 0), in(res_cube_server_stg.t_asset.group_id, 22099, 56611, 4825, 3570, 3571, 4984, 10591, 56429, 22145, 3631, 3572, 58375, 539908, 58819, 3544, 3574, 310, 3632, 5081, 4222, 5001, 3630, 3633, 3634, 3635), 1.04 MB, N/A
└─Batch_Point_Get_5, 2594.00, 2593, root, table:t_asset, time:67.5ms, loops:3, BatchGet:{num_rpc:3, total_time:82.6ms}, total_process_time: 64ns, total_wait_time: 5ns, tikv_wall_time: 74ms, scan_detail: {total_process_keys: 2593, total_process_keys_size: 417880, total_keys: 2597, get_snapshot_time: 122.1µs, rocksdb: {delete_skipped_count: 10, key_skipped_count: 3, block: {cache_hit_count: 10801}}}, handle:[86276 87001 87002 87641 87649 87781 87795 87796 87797 87798 87802 87805 87806 87812 87821 87830 87837 87843 87844 87853 102573 102574 106256 106257 141096 141097 141098 142987 142988 142989 142991 142992 142993 142994 146769 146770 146771 146772 146773 146774 146775 146776 146777 146778 146779 146780 146781 146782 146783 146784 146785 146786 146787 146788 146789 146790 146791 146792 146793 146794 146795 146796 146797 146798 146799 146800 146801 146802 146803 146804 146805 146806 146807 146808 146809 146810 146811 146812 146813 146814 146815 146816 146817 146818 146819 146820 146821 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5443944 5444240 5444556 5444892 5444982 5445169 5445170 5445171 5445172 5445173 5445174 5445175 5445176 5445177 5445178 5445181 5445182 5445183 5445184 5445185 5445186 5445187 5445188 5445189 5445190 5445191 5445193 5445200 5445205 5445206 5445207 5445208 5445209 5445210 5445211 5445212 5445213 5445356 5445357 5445358 5445359 5445360 5445361 5445362 5445363 5445364 5445369 5445370 5445371 5445372 5445373 5445374 5445375 5446016 5446635 5446647 5446649 5446650 5446823 5446824 5447231 5448072 5448073 5448074 5448079 5448084 5448209 5448210 5448211 5448213 5448219 5448220 5448230 5448428 5448429 5448430 5448431 5448434 5448436 5448470 5449275 5449276 5449277 6000056 6000057 6000058], keep order:false, desc:false, N/A, N/A

差距比较明显。自己菜鸟一个,调试好久不知道问题在哪,感觉是跟IN条件太长了有关?但是现在业务上改动可能比较困难,有没有什么好的办法?

另外,有点不明白的是,执行计划中的时间都只有几十ms,但实际数据返回切切实实是花了1.3秒多的,网络环境上我可以确保是很好的,最终结果集也只有1MB不到,那额外的时间开销是花在哪里了呢?

【后续】:
这个问题在一个更长的IN(大约十万个)查询中找到原因了,tidb对于这么长的IN生成执行计划要花很久,这是真正慢的原因,实际查询时间是很短的(看下图)。

这个时间开销恰好是EXPLAIN ANALYZE不包含的。。。

开启优化规则试试

您把执行计划发下吧。 并行是个思路, tiflash也可以考虑下啊

explain analyze 查看执行计划,跟原来postgresql的执行计划对比一下,就知道问题在哪里了。很多时候dba为了省事,配置tidb不自动进行统计信息采集,也可能会带来问题。你可以看看表统计信息是否采集了。

Batch_Point_Get 应该是最合理的了吧

能不能deleted =0 先过滤出数据 再进行哪些in 的条件过滤

PG 可能都在内存,TiKV 需要 TiDB → PD → TiKV 然后分批读磁盘 region
IN 值数量如果固定,可以 prepare 减少一点生成 plan 时间

in 值是固定的?还是动态的?

以及 IN 值能否通过逻辑查表得到呢

并行是指的什么?

执行计划在原帖中重新附上了。

表统计信息采集过了。两个执行计划都在原帖重新附上了,但是tidb是走的BatchPointGet,postgresql走的index,两者看起来都用了各自的最优查询,但是tidb的执行时间就是要长很多。

我也这么觉得,但是tidb返回就是比postgresql慢很多。。。

IN值是动态的,可以写成子查询拿到。

效果不太明显。。。

把那些in值放到临时表里面,会不会快一些

point应该是直连了 kitvclient,可以减少点值,尝试找一找是否存在差异分水岭?

改写SQL吧

你的执行计划里面显示没那么慢啊,你在dashboard中查一下这个sql慢在哪块

临时表加主键 join操作